The 18NLW4500 is a 18" (466 mm) extended low frequency loudspeaker, designed for use in vented, bandpass or even horn loaded ì enclosures. The loudspeaker is designed to withstand high power levels without damage while providing clean and undistorted LF reproduction at a very high SPL. For optimum results we recommend amplifiers able to deliver 3600 Watt program power. The 18NLW4500 features a unique motor featuring a high grade Neo magnet assembly in a structure optimized for thermal and magnetic efficiency. 18NLW4500 features include a large displacement suspension system which, in conjunction with a composite reinforced, straight ribbed cone and the Eighteen Sound proprietary SDR technology, allows an undiostorted ultra-linear piston action and provides full mechanical control across the entire working range. The 115mm (4.5 in) state-of-the-art voice-coil utilizing Interleaved Sandwich Voice coil (ISV) technology, provides high levels of thermal stability and durability. The ISV technology achieves a balanced linear motor unit exerting an exceptionally high force factor.
Mounting and Shipping Info
Nominal Impedance4 Ω
Minimum Impedance4.2 Ω
Nominal Power Handling11800 W
Continuous Power Handling23600 W
Frequency Range30 - 1000 Hz
Voice Coil Diameter115 mm (4.5 in)
Winding Depth36.0 mm (1.42 in)
Magnetic Gap Depth13.0 mm (0.51 in)
Surround ShapeTriple roll
Woofer Cone TreatmentWeather protected
Recommended Enclosure200.0 dm3 (7.06 ft3)
Recommended Tuning40 Hz
Resonance Frequency37 Hz
Vas127.0 dm3 (4.48 ft3)
Sd1225.0 cm2 (189.88 in2)
Overall Diameter462 mm (18.19 in)
Bolt Circle Diameter440 mm (17.32 in)
Baffle Cutout Diameter422.0 mm (16.61 in)
Depth233 mm (9.17 in)
Flange and Gasket Thickness23 mm (0.93 in)
Net Weight12.0 kg (26.46 lb)
Shipping Weight13.5 kg (29.76 lb)
2 hours test made with continuous pink noise signal within the range Fs-10Fs. Power calculated on rated minimum impedance. Loudspeaker in free air.
Power on Continuous Program is defined as 3 dB greater than the Nominal rating.
Applied RMS Voltage is set to 2.83 V for 8 ohms Nominal Impedance.